Avantco 177400046 High-Limit Thermostat 450°F Cap 30"

A hi-limit thermostat is a safety sensor used in commercial fryer and cooking equipment to monitor temperature and prevent the equipment from operating if it becomes too hot. It acts as a protective switch, stopping operation when the internal temperature reaches unsafe levels up to 450°F/232°C. The capillary and bulb sensing system continuously monitors temperature changes inside the cooking chamber and triggers a cutoff response when necessary. This hi-limit thermostat is used in gas fryers for commercial frying applications commonly found in restaurant and foodservice kitchens. During operation, the 30" capillary tube and 1/4" x 4-1/2" bulb transfer temperature readings from the fryer chamber to the control unit for accurate heat detection. It has an auto-reset feature that resumes normal operation when the temperature falls within a safe range. If the hi-limit is found to be faulty and not operating or resetting properly, replacing it may help restore safe shutdown function and minimize overheating issues during normal operation.

Equipment Compatibility:
Typical safety control applications for hi-limit thermostats include commercial gas fryers and heavy-duty cooking equipment used in restaurant kitchens where over-temperature protection is required for safe operation. This Hi-Limit Thermostat 177400046 is compatible with equipment from Vulcan Hart, Atosa, Hobart, Maxx Cold, U-Line, Entrée, and other related brands where automatic high-temperature cutoff control is required for fryer safety and operation.
Brand Compatibility
Replaces multiple part numbers across various commercial fryer and cooking equipment brands, including Vulcan Hart, Hobart, Atosa, Avantco, Maxx Cold, U-Line, Entrée, Adcraft, and other manufacturers that use compatible capillary hi-limit thermostat safety control systems. Refer to the “Replaces Parts” section for complete cross-reference details.

Product Specifications:

Product Type: Hi-Limit Thermostat
Manufacturer: Avantco
SKU: 177400046
Temperature Rating: 450°F (232°C)
Capillary Length: 30"
Bulb Size: 1/4" x 4-1/2"
Connection Type: 3/8" MPT stuffing box
Function: Over-temperature safety cutoff control
Reset Type: Auto reset
Application: Commercial gas fryers and cooking equipment
Control Type: Millivolt safety thermostat system

Key Features:

• Provides a high-temperature safety cutoff to protect fryer equipment from overheating conditions
• Uses a capillary bulb sensing system to detect heat changes inside the cooking chamber
• Auto reset design allows the system to resume operation after the temperature returns to a safe level
• Works with millivolt safety control systems commonly used in commercial fryer units
• Replacement part for hi-limit thermostats that are not shutting off or resetting correctly
• “After installing the new hi-limit thermostat, the fryer started cutting off at the right temperature again, and the overheating issue stopped during regular operation.”